I guess I don't understand what you mean by the "2 metal pieces"?  Perhaps the arrow rest?  If so perhaps the rest is worn or it needs to be centered up with the bow string using a center serve.  It could be also that your draw is much longer than what the arrows are cut too and your pulling past the rest, which can be dangerous.

Making a bow is a challenging process and you might be ahead to either fix the Nova that you have or purchase a packaged bow.  Many manufactures are producing complete package bows that have everything but arrows and are nearly ready to go.  A local bow shop could help with picking out a package or perhaps even a quality used bow.  A may be even possible to use some of the accessories you have (the Truglo sight, quiver, etc) and have them installed on a new entry level bow.

If your just getting into archery it really will help to have a good bow shop (or experienced archer) helping you.  From setting the draw length, to the correct draw weight, to sighting in the bow it can be a bit rough when getting started...

Yeah, arrow rest. Lol. I couldn't remember what it was called. I like the Nova because it's lightweight but there's a couple things that I'd change if I could. There's a local hunting shop that might be able to help me out with getting me set up with what I need so I'll ask them.